4. Which of the following atoms has the highest first ionization energy? (1B)
a) Li b) Na c) F d) O e) C

5. Consider the Bohr model of the hydrogen atom. When an electron moves from the n = 1 orbit to the
n = 6 orbit, which of the following statements is true?
(1B)
a) energy is absorbed
b) light is emitted
c) the electron can have a continuous range of energies in between those of the n=1 and 6 orbits
d) all of the above
e) none of the above

6. Line spectra from all regions of the electromagnetic spectrum, including the Paschen series of infrared lines for hydrogen, are used by astronomers to identify elements present in the
atmospheres of stars.

Calculate the wavelength of the photon emitted when the hydrogen atom undergoes a transition from n = 5 to n = 2 . (1B)

20. The size of an atomic orbital is associated with (1B)
a) the principal quantum number (n).
b) the angular momentum quantum number (l).
c) the magnetic quantum number (ml).
d) the spin quantum number (ms).
e) the angular momentum and magnetic quantum numbers, together.

34. The orbital diagram for a ground-state nitrogen atom is (1B)

a) a b) b c) c d) d e) e

1. Which of the following statements is TRUE concerning d orbitals? (1A10)
A. Each one is spherical in shape.
B. All of the other answers are false.
C. They all have two lobes and are "dumbbell" shaped.
D. There are three of them for a given n value.
E. A 3d orbital is smaller than a 5d orbital

14. Which of the following elements has the largest atomic size? (1A10)
A. Ba
B. S
C. Ca
D. Po
E. Rn

16. Consider the emission spectrum for a hydrogen atom and determine which of the following statements is
FALSE? (1A10)
A. Light is emitted in the visible, infrared and ultraviolet regions of the electromagnetic radiation spectrum
B. The dark regions in the spectrum correspond to allowed electron transitions
C. Atoms emit light
D. Emission lines correspond to electron transitions from distances farther from the nucleus to those closer to
the nucleus
E. An atom is quantized (i.e. has only certain energies available to it)

B. The dark regions in the spectrum correspond to allowed electron transitions

30. What is the maximum number of electrons in an atom that can have the following set of quantum numbers? (1A10)
n = 4 l = 3 ms = +1/2
A. 14
B. 7
C. 1
D. 0
E. 2

32. The shape of an atomic orbital is associated with (1A10)
A. the magnetic quantum number (ml).
B. the spin quantum number (ms).
C. the principal quantum number (n).
D. the magnetic and spin quantum numbers, together.
E. the angular momentum quantum number (l).

34. Considering the fact that the visible region of the electromagnetic spectrum spans from 290 nm to 850 nm, what is true concerning the transition of an electron from the n = 1 orbit to the n = 6 orbit. (1A10)
A. light is absorbed that cannot be seen by the human eye
B. visible light is absorbed
C. light is emitted that cannot be seen by the human eye
D. visible light is emitted

10. Complete this sentence: The PCl5 molecule has (2A10)
A. nonpolar bonds, and is a nonpolar molecule.
B. nonpolar bonds, but is a polar molecule.
C. polar bonds, but is a nonpolar molecule.
D. polar bonds, and is a polar molecule.

11. The number of resonance structures for the best Lewis structure of sulfur dioxide is: (2A10)
A. 4
B. there is only one structure (i.e. no resonance)
C. 3
D. 2

12. Which response includes all the molecules below that do not follow the octet rule for the central atom? (2A10)
(1) H2S (2) BCl3 (3) PH3 (4) SF4
A. PH3 and SF4
B. BCl3 and PH3
C. BCl3 and SF4
D. All four Lewis structures obey the octet rule for the central atom
E. H2S and BCl3